Windows: Four tips to Maximize Efficiency for Your House (Sustainable Building, Episode 3)
Four things to look for when reviewing the energy star label for windows:
1. Vinyl or Fiberglass material
2. Double or Triple pane / glazed
3. "Low-E" (emissivity) coating
4. Argon or Krypton gas filling
Note: The lower the "U-Factor" (efficiency rating), the better